Do Carrots Improve Your Vision? 15 Misconceptions About Your Eyesight

iStock
iStock

We can probably all recount at least a dozen weird and alarming things parents, teachers, and older siblings told us about our eyes when we were kids. For instance, we’d be permanently cross-eyed if we didn’t stop making those faces at our brother or we’d go blind from reading in the dark. But maybe, just maybe, we could find redemption by eating lots of carrots. Here are a few common myths and misconceptions.

MYTH #1: IF YOU CROSS YOUR EYES, THEY'LL STAY THAT WAY.

It’s a myth that your eyes will “freeze” if you cross them for too long. Crossed eyes, or strabismus, occurs when your eyes don’t look the same way at the same time. There are six muscles attached to each of our eyes that, guided by signals from the brain, control their movements. When your eyes don’t align, the brain gets two different images. Over time, this can cause more serious vision issues. That’s a real problem, but it’s not caused by making your eyes cross on purpose for short periods of time.

MYTH #2. EATING CARROTS WILL HELP YOU SEE IN THE DARK.

Well, carrots certainly aren’t bad for your eyesight. They contain plenty of beta-carotene, which your body converts into vitamin A, a crucial vitamin for vision. But carrots don’t do anything exceptional for your nighttime vision.

MYTH #3: THE BIGGER YOUR EYES, THE BETTER YOUR EYESIGHT.

When you’re born, your eyeballs are approximately 16 millimeters in diameter, reaching 24 millimeters as an adult. But your eyes getting larger does not necessarily mean that your vision is getting better. In fact, excessive growth in human eyes can cause myopia, or nearsightedness. If the eyeball is too long, the eye’s lens can’t focus the light in the right part of the retina to process images clearly.

MYTH #4: PUPIL DILATION OCCURS ONLY IN RESPONSE TO CHANGES IN LIGHT.

We all know that pupils contract in light and dilate in darker conditions. But did you know that pupils also respond to changes in our emotional and mental state? Sexual arousal, solving a complicated mental math problem, fear, and other cognitive and emotional events can provoke changes in pupil size, though the precise reasons why are not yet clearly understood.

MYTH #5: UV RAYS CAN ONLY DAMAGE EYES WHEN THE SUN IS SHINING.

Even on cloudy and foggy days, ultraviolet (UV) radiation can cause eye damage. The rays can be reflected off of water, sand, snow and shiny surfaces. So make sure to keep your 100 percent UV protection sunglasses handy whenever you are out and about. Years of exposure can increase your risk of developing cataracts, a clouding of the eye lens that can cause vision loss.

MYTH #6: WEARING GLASSES TOO MUCH CAN MAKE YOUR EYESIGHT WORSE.

This myth suggests that over-reliance on glasses for common vision problems like nearsightedness, farsightedness, and astigmatism will weaken or damage eyes. That’s not true, nor will your eyes be damaged by wearing glasses with a prescription that’s too strong—though it may give you a temporary strain or headache.

However, children should still be given the correct prescription. A 2002 study found that giving children glasses with a prescription that is too weak can increase their myopia, while giving the correct prescription “reduces the progression of myopia.”

MYTH #7: READING IN DIM LIGHT WILL DIMINISH YOUR EYESIGHT.

How many of you recall your parents telling you to “put some light on the subject” when you were curled up with a good book in dwindling daylight? Having more light can certainly help you see better, because it makes it easier for you to focus. But while reading in semi-darkness may put a temporary strain on your eyes, it’s not going to permanently damage your eyesight. Recent studies indicate not getting enough daylight in general, however, may have a detrimental effect on vision.

MYTH #8: IF YOUR PARENTS HAVE BAD EYESIGHT, YOU WILL, TOO.

You might, of course, because some eye problems are genetic. But there’s no guarantee that we will develop the same vision impairments as our parents. One study found that if both parents are myopic, there’s a 30 to 40 percent chance that the child is. If only one parent is myopic, the child has a 20 to 25 percent chance, and it's down to 10 percent for kids with non-myopic parents.

MYTH #9: TOO MUCH SCREEN TIME WILL DESTROY YOUR EYESIGHT.

Optometrists frequently debate this topic, but most agree that it’s not too damaging for most people. Having said that, more and more people are complaining of symptoms like dry, irritated eyes, headaches, eye strain and difficulty focusing after prolonged periods of screen time. The American Optometric Association (AOA) defines this group of symptoms collectively as Computer Vision Syndrome—or Digital Eye Strain—which can be further exacerbated by trying to focus on small screens such as tablets or phones. The AOA recommends following the 20-20-20 rule to remediate the effects of screen time: Every 20 minutes, take a 20-second break to look at something 20 feet away.

MYTH #10: THE RIGHT "VITAMIN COCKTAIL" CAN PREVENT VISION DECLINE.

Recent studies don’t support the notion that the right combination of vitamins can keep your eyesight from deteriorating, according to Harvard researchers. A National Institutes of Health study showed that antioxidant vitamins may help slow the progression of macular degeneration, one of the most common causes of vision loss as we age. But for people not already suffering from the disease, preventative use of such vitamins didn’t appear to make a significant difference. Perhaps an effective vitamin cocktail will be discovered one day, but so far, there’s no proof that it works.

MYTH #11: DYSLEXIA IS LINKED TO VISION PROBLEMS.

A recent study from Bristol and Newcastle Universities in the UK found that children with dyslexia were no more likely than others to suffer from common vision problems like myopia, far-sightedness, squinting or focusing problems.

MYTH #12: IF YOU DON'T TREAT LAZY EYE WHEN YOU'RE A SMALL CHILD, YOU'LL HAVE IT FOREVER.

Lazy eye, or amblyopia, occurs when nerve pathways between the brain and the eye aren’t properly stimulated, causing the brain to favor one eye over the other. The weaker eye tends to wander, and eventually the brain might ignore signals received from that eye. While doctors say that the sooner it’s treated the better, there are an increasing number of remedies (including Tetris) that can help adults as well.

MYTH #13: BLIND PEOPLE SEE ONLY DARKNESS.

According to the American Foundation for the Blind, only 18 percent of people who have visual impairments are totally blind. Most are able to differentiate between light and dark.

MYTH #14: HUMAN VISION IS THE SAME IN SPACE AS IT IS ON EARTH.

Actually, NASA scientists have found that space can impair our vision, though they still aren’t sure why. A study of seven astronauts who spent more than six months on the International Space Station noted that all experienced blurry vision during and for months after their space mission. The researchers hypothesized that the shift of fluids toward the head that can occur in microgravity might have something to do with it. Now, NASA is following up with a study that will track the vision of crew members during and after long space missions to try and determine exactly why these vision changes occur in space.

MYTH #15: PEOPLE WHO ARE COLORBLIND CAN'T SEE COLOR.

The human eye and brain work together to interpret color from light, and each of us perceives color slightly differently. We all have photopigments—color-detecting molecules—in cone-shaped cells inside our retinas. But people who suffer from hereditary color blindness have defects in the genes that direct production of photopigments. It’s quite rare for someone not to see color at all, however. It's more common for color blind individuals to have difficulty differentiating between certain colors, like red and green, or blue and yellow. And while color blindness is far more common in males than females, it does affect a small percentage of women.

Whiten Your Teeth From Home for $40 With This Motorized Toothbrush

AquaSonic
AquaSonic

Since many people aren't exactly rushing to see their dentist during the COVID-19 pandemic, it's become more important than ever to find the best at-home products to maintain your oral hygiene. And if you're looking for a high-quality motorized toothbrush, you can take advantage of this deal on the AquaSonic Black Series model, which is currently on sale for 71 percent off.

This smart toothbrush can actually tell you how long to keep the brush in one place to get the most thorough cleaning—and that’s just one of the ways it can remove more plaque than an average toothbrush. The brush also features multiple modes that can whiten teeth, adjust for sensitive teeth, and massage your gums for better blood flow.

As you’d expect from any smart device, modern technology doesn’t stop at functionality. The design of the AquaSonic Black Series is sleek enough to seamlessly fit in with a modern aesthetic, and the charging base is cordless so it’s easy to bring on the go. The current deal even includes a travel case and eight Dupont replacement heads.

Right now, you can find the AquaSonic Black Series toothbrush on sale for just $40.

Price subject to change.

 

AquaSonic Black Series Toothbrush & Travel Case With 8 Dupont Brush Heads - $39.99

See Deal


This article contains affiliate links to products selected by our editors. Mental Floss may receive a commission for purchases made through these links. If you haven't received your voucher or have a question about your order, contact the Mental Floss shop here.


30 Cold, Hard Facts About Die Hard

Alan Rickman and Bruce Willis in Die Hard (1988).
Alan Rickman and Bruce Willis in Die Hard (1988).
20th Century Fox Home Entertainment

What do you get when you mix one part action movie with one part holiday flick and add in a dash of sweaty tank top? Die Hard, John McTiernan’s genre-bending (Christmas?) action masterpiece for the ages, which sees a badass NYPD cop take on a skyscraper full of bad guys in the midst of an office holiday party. Here are 30 things you might not know about the movie, which was released on July 15, 1988.

1. Die Hard has a literary background.

Think some action-loving Hollywood scribe came up with the concept for Die Hard? Think again. The movie is based on Roderick Thorp’s 1979 crime novel Nothing Lasts Forever, which is a sequel to his 1966 novel, The Detective. In 2013, Thorp’s long out-of-print book was resurrected to coincide with the film’s 25th anniversary.

2. Die Hard was inspired by The Towering Inferno.

The idea for Nothing Lasts Forever was inspired John Guillermin’s 1974 disaster flick The Towering Inferno. After seeing the film, Thorp had a dream about a man being chased through a skyscraper by a group of men with guns. He eventually turned that snippet of an idea into a sequel to The Detective.

3. Frank Sinatra got first dibs on playing the role of John McClane in Die Hard.


Getty Images

Because he had starred in the big-screen adaptation of The Detective, Frank Sinatra had to be offered the role in its sequel. At the age of 73, he smartly turned it down.

4. Bruce Willis's big-screen debut was with Frank Sinatra.

In 1980, Willis made his film debut (albeit uncredited) in the crime thriller The First Deadly Sin. He has no name and if you blink you’ll miss him, but the role simply required that Willis entered a diner as Sinatra’s character left it. Maybe it was kismet?

5. Clint Eastwood planned to take a stab at playing John McClane.

Originally, it was Clint Eastwood who owned the movie rights to Nothing Lasts Forever, which he had planned to star in in the early 1980s. That obviously never happened.

6. Die Hard was never supposed to be a sequel to Commando.

This is one of the most popular internet stories about Die Hard. But according to Stephen de Souza, the screenwriter of both Die Hard and Commando, while there was a sequel to Commando planned, the only similarity with Die Hard is that they both took place in buildings. According to de Souza, Escape Plan is the closest to his original Commando 2 idea and Die Hard was never supposed to be anything but Die Hard.

7. Bruce Willis was hardly the studio's first choice for the lead in Die Hard. He wasn't even their third choice.

If Die Hard was to be a success, the studio knew they needed a bona fide action star in the part, so they set about offering it to a seemingly never-ending list of A-listers of the time. Rumor has it that Sylvester Stallone, Harrison Ford, Robert De Niro, Charles Bronson, Nick Nolte, Mel Gibson, Richard Gere, Don Johnson, Burt Reynolds, and Richard Dean Anderson (yes, MacGyver!) were all considered for the role of John McClane. And all declined it.

8. Bruce Willis was considered a comedic actor when Die Hard came around.

Die Hard’s producers had nothing against Bruce Willis, of course. He just wasn’t an immediate choice for the role because, up until that point, he was known solely as a comedic actor, not an action star. Following the success of the film, the action genre really became Willis’s bread and butter, and although he has two Emmys for his comedy work, it has remained as such to this day.

9. Bruce Willis was barely even seen on the posters for Die Hard.

Bruce Willis stars as John McClane in 'Die Hard.'
20th Century Fox Home Entertainment

Because the studio’s marketing gurus were unconvinced that audiences would pay to see an action movie starring the funny guy from Moonlighting, the original batch of posters for the film centered on Nakatomi Plaza instead of Willis’s mug. As the film gained steam, the marketing materials were altered, and Willis was more prominent in the promos.

10. Bruce Willis was paid $5 million for Die Hard, which was considered a pretty major payday at the time.

Even with all the uncertainly surrounding whether he could pull the film off, Willis was paid $5 million to make Die Hard, which was considered a rather hefty sum at the time—a figure reserved for only the top tier of Hollywood talents.

11. Bruce Willis suggested Bonnie Bedelia for the part of his wife in Die Hard.

Though we suspect that she wasn’t paid $5 million for the gig.

12. Bruce Willis was able to accept the role in Die Hard thanks to a well-timed pregnancy.

The first few times Bruce Willis was asked to star in the movie, he had to say no because of his commitments to Moonlighting. Then costar Cybill Shepard announced that she was pregnant. Because her pregnancy wouldn’t work within the show, producer Glenn Caron gave everyone 11 weeks off, allowing Willis to say yes.

13. Sam Neill was originally approached to play the role of Hans Gruber in Die Hard.

But Neill ended up turning the film down. Then, in the spring of 1987, the casting director saw Alan Rickman playing the dastardly Valmont in a stage production of Dangerous Liaisons and knew they had found their Hans.

14. Die Hard was Alan Rickman's feature film debut.

Though Rickman may have played the part of Hans as cool as the other side of the pillow, it was actually his first role in a feature film.

15. John McTiernan originally passed on directing Die Hard—more than once, too.

And not just once, but on a few different occasions. His reason was that the material just seemed too dark and cynical for him. “The original screenplay was a grim terrorist movie,” McTiernan told Empire magazine in 2014. “On my second week working on it, I said, 'Guys, there's no part of terrorism that's fun. Robbers are fun bad guys. Let's make this a date movie.’ And they had the courage to do it.”

16. John McTiernan sees Die Hard as a Shakespearean tale.

In the original script, the action in Die Hard takes place over a three-day span, but McTiernan—inspired by Shakespeare’s A Midsummer Night’s Dream—insisted that it be condensed into a single evening.

17. Die Hard's Nakatomi Plaza is actually Fox Plaza.

Fox Plaza played the part of Nakatomi Plaza in 'Die Hard.'
Fox Plaza played the part of Nakatomi Plaza.

Yes, the corporate headquarters of 20th Century Fox—the very studio making the movie—proved to be the perfect location for the movie’s much-needed Nakatomi Plaza. And as it was still under construction, there wasn’t a whole lot they needed to do to the space to make it movie-ready. The studio charged itself rent to use its own space.

18. The room where the hostages are held in Die Hard is supposed to be Frank Lloyd Wright's Fallingwater.

"In this period, Japanese corporations were buying America," production designer Jackson De Govia said in the Die Hard DVD audio commentary. "We posited that ... Nakatami Corporation bought Fallingwater, disassembled it, and reassembled it in the atrium, like a trophy."

19. The panoramic view of the city below in Die Hard? It's not real.

A 380-foot-long background painting provided the illusion of a breathtaking city view in the movie. And it was a state-of-the-art one, too, with animated lights, moving traffic, and the ability to change from night to day. The painting is still the property of the studio and has been used in other productions since.

20. Die Hard's success spawned a bona fide franchise.

In addition to its four sequels, Die Hard has spawned video games and comic books, too.

21. John McClane's tumble down a ventilation shaft in Die Hard was an accident.

Or maybe “error” would be a better word. But in the scene in which McClane jumps into an elevator shaft, his stunt man was supposed to grab onto the first vent. But he missed. By a lot. Which made the footage even more exciting to watch, so editor Frank J. Urioste kept it in the final cut.

22. Alan Rickman's death scene in Die Hard was also pretty scary.

At least it was for Rickman. In order to make it look as if he was falling off a building, Rickman was supposed to drop 20 feet onto an air bag while holding onto a stunt man. But in order to get a genuinely terrified reaction out of him, they dropped him on the count of two—not three, as was planned.

23. Bruce Willis suffered permanent hearing loss from shooting Die Hard.


Twentieth Century Fox

In order to get the hyper-realism that director John McTiernan was looking for, the blanks used in the guns in the movie were modified to be extra loud. In one scene, Willis shoots a terrorist through a table, which put the action star in extremely close proximity to the gun—and caused permanent hearing loss. He referenced the injury in a 2007 interview with The Guardian. When they asked Willis his most unappealing habit, he replied that, “Due to an accident on the first Die Hard, I suffer two-thirds partial hearing loss in my left ear and have a tendency to say, ‘Whaaa?’”

24. Alan Rickman wasn't thrilled with how noisy Die Hard was either.

Whenever he had to shoot a gun in the film, Rickman couldn’t help but flinch. Which forced McTiernan to have to cut away from him so that his reactions were not caught on film.

25. Hans Gruber's American accent in Die Hard caused a lot of problems.

The scene in which Rickman, as Gruber, slips into an American accent and pretends to be yet another hostage who got away was insisted on by screenwriter Steven de Souza, who wanted them in a room together to duke it out. But McTiernan was never happy with Rickman’s American accent, saying, “I still hear Alan Rickman’s English accent. I was never quite happy with the way he opened his mouth [in that scene] ... I shot it three times trying to get him to sound more stridently American ... it’s odd for someone who has such enormous verbal skills; he just had terrible trouble getting an American accent.”

26. The German Hans Gruber speaks in Die Hard is mostly gibberish.

And the bulk of his German cohorts were not German either. Bruce Willis, on the other hand, was actually born in West Germany to an American father and a German mother.

27. Bruce Willis has four feet in Die Hard.

As Willis spends much of the movie in his bare feet running through broken glass, he was given a pair of rubber feet to wear as a safety precaution. Which is great and all, but if you look closely in certain scenes, you can actually see the fake appendages.

28. You can see (but can't touch) John McClane's sweaty tank top.


Getty Images

In 2007, Willis donated the blood-soaked tank top he wore in Die Hard to the National Museum of American History at the Smithsonian.

29. Die Hard's famous “Yippee-ki-yay" line stole the movie.

It was a simple line: “Yippee-ki-yay, motherf*cker!” But it became the film’s defining moment, and the unofficial catchphrase that has been used in all four Die Hard sequels as well.

30. The credit for Die Hard's famous “Yippee-ki-yay" line belongs to Bruce Willis.

In a 2013 interview with Ryan Seacrest, Bruce Willis admitted that “Yippee-ki-yay, motherf*cker!” was really just a joke. “It was a throwaway,” said Willis. “I was just trying to crack up the crew and I never thought it was going to be allowed to stay in the film."